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Health Calculators That Actually Work

Science-backed calculators for body composition, nutrition, fitness, pregnancy, and general health. Free, instant, in your browser.

⚖ïļ Body & Weight

⚖ïļ BMI Calculator Body Mass Index with health category 💊 Body Fat % US Navy method with category rating ⭐ Ideal Weight Robinson, Miller, Devine formulas ðŸĶī Lean Body Mass Boer & James formula estimates 📏 Waist-to-Hip Ratio WHO health risk classification 📐 Waist-to-Height Ratio Central obesity indicator 🏋ïļ FFMI Fat-Free Mass Index for athletes 📉 Weight Loss Timeline, deficit & goal date

🍎 Nutrition & Energy

ðŸ”Ĩ BMR Calculator Basal Metabolic Rate at rest ⚡ TDEE Calculator Total Daily Energy Expenditure ðŸĨ™ Calorie Calculator Daily calories for your goal ðŸĨ— Macro Calculator Protein, carbs & fat targets ðŸĨĐ Protein Intake Daily protein by activity level 💧 Water Intake Daily hydration needs ⏰ Intermittent Fasting Eating & fasting windows

🏃 Fitness

🏆 One Rep Max Max strength from reps & weight ðŸšī VO2 Max Aerobic fitness estimate âĪïļ Heart Rate Zones 5-zone training breakdown 🏃 Calories Burned Exercise energy expenditure ⏱ïļ Running Pace Pace, speed & finish time ðŸ‘Ģ Steps to Calories Calories burned from step count

ðŸĪ° Pregnancy & Fertility

ðŸĪ° Due Date Estimated delivery date 📅 Ovulation Ovulation day & fertile window ðŸŒļ Fertility Window Best days to conceive ðŸ‘ķ Baby Growth Fetal size by week ðŸĐļ Period Calculator Next period & fertile window

ðŸĐš General Health

🎂 Age Calculator Exact age in years, months, days 🍚 BAC Calculator Blood alcohol concentration 🍷 Alcohol Units Units per drink and per week 🚭 Smoking Cost Annual financial & health cost ðŸ˜ī Sleep Calculator Optimal wake & sleep times ðŸĐļ Diabetes Risk Type 2 diabetes risk score ðŸŦ€ Cholesterol Ratio HDL/LDL cardiovascular risk 💉 Blood Pressure Stage classification & guidance 🌟 Life Expectancy Estimate based on lifestyle factors